Classe AttributeQueryExpression

Article
12/01/2014

S'applique à: CRM 2015 on-prem, CRM Online

Defines a complex query to retrieve attribute metadata for entities retrieved using an EntityQueryExpression

Espace de noms: Microsoft.Xrm.Sdk.Metadata.Query
Assembly: Microsoft.Xrm.Sdk (dans Microsoft.Xrm.Sdk.dll)

Syntaxe

'Déclaration
<DataContractAttribute(Name:="AttributeQueryExpression", Namespace:="https://schemas.microsoft.com/xrm/2011/Metadata/Query")> _
Public NotInheritable Class AttributeQueryExpression
    Inherits MetadataQueryExpression

[DataContractAttribute(Name="AttributeQueryExpression", Namespace="https://schemas.microsoft.com/xrm/2011/Metadata/Query")] 
public sealed class AttributeQueryExpression : MetadataQueryExpression

Remarques

The following example shows the use of an AttributeQueryExpression to retrieve entity metadata.

//A condition expresson to return optionset attributes
MetadataConditionExpression[] optionsetAttributeTypes = new MetadataConditionExpression[] { 
new MetadataConditionExpression("AttributeType", MetadataConditionOperator.Equals, AttributeTypeCode.Picklist),
new MetadataConditionExpression("AttributeType", MetadataConditionOperator.Equals, AttributeTypeCode.State),
new MetadataConditionExpression("AttributeType", MetadataConditionOperator.Equals, AttributeTypeCode.Status),
new MetadataConditionExpression("AttributeType", MetadataConditionOperator.Equals, AttributeTypeCode.Boolean)
};

//A filter expression to apply the optionsetAttributeTypes condition expression
MetadataFilterExpression AttributeFilter = new MetadataFilterExpression(LogicalOperator.Or);
AttributeFilter.Conditions.AddRange(optionsetAttributeTypes);

//A Properties expression to limit the properties to be included with attributes
MetadataPropertiesExpression AttributeProperties = new MetadataPropertiesExpression() { AllProperties = false };
AttributeProperties.PropertyNames.Add("OptionSet");
AttributeProperties.PropertyNames.Add("AttributeType");
   
   
   ...
   
   
   
//An entity query expression to combine the filter expressions and property expressions for the query.
EntityQueryExpression entityQueryExpression = new EntityQueryExpression()
{

 Criteria = EntityFilter,
 Properties = EntityProperties,
 AttributeQuery = new AttributeQueryExpression()
 {
  Criteria = AttributeFilter,
  Properties = AttributeProperties
 },
 LabelQuery = labelQuery

};

//Retrieve the metadata for the query without a ClientVersionStamp
RetrieveMetadataChangesResponse initialRequest = getMetadataChanges(entityQueryExpression, null, DeletedMetadataFilters.OptionSet);

Hiérarchie d'héritage

System.Object
   Microsoft.Xrm.Sdk.Metadata.Query.MetadataQueryBase
     Microsoft.Xrm.Sdk.Metadata.Query.MetadataQueryExpression
      Microsoft.Xrm.Sdk.Metadata.Query.AttributeQueryExpression

Cohérence de thread

Tous les membres statiques publics (Shared dans Visual Basic) de ce type sont thread-safe. Tous les membres d'instance ne sont pas garantis thread-safe.

Plateformes

Plateformes de développement

Windows Vista, Windows Server 2003 et

Plateformes cibles

Windows 98,Windows 2000,Windows 2000 Server,Windows CE,Windows Server 2008,Windows 98 Deuxième Édition,Pocket PC,Smart Phone,Windows Server 2003,Windows XP Professionnel,Windows Vista,Windows XP

Change History

Voir aussi

Référence

Membres AttributeQueryExpression
Espace de noms Microsoft.Xrm.Sdk.Metadata.Query

Autres ressources

Query and Capture Changes to Metadata
Sample: Query Metadata and Detect Changes

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